The UWB Wearable Devices can be of three types (i.e., tag, anchor and gateway) and are used in indoor environments to provide location information. Typically, the anchors are placed in fixed and well known positions in the region of interest. The tags are worn by workers and/or installed on mobile objects whose positions need to be estimated. During the estimation process the tags continuously interact with anchors. In particular, each tag performs range measurements with respect to the anchors that are in the connectivity range. After that, a localization algorithm, which runs on the tag itself, uses range measurements and anchor positions to estimate the tag’s position. Finally, the gateway is the end-point of the localization devices; it receives localization data from tags and forwards them to the Localization Manager through the Middleware by using a serial interface.
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